A solemn appeal whereby one person imposes on another the obligation of speaking or acting as if under an oath (1 Samuel 14:24; Joshua 6:26; 1 Kings 22:16).

We have in the New Testament a striking example of this (Matthew 26:63; Mark 5:7), where the high priest calls upon Christ to avow his true character. It would seem that in such a case the person so adjured could not refuse to give an answer.

The word "adjure", i.e., cause to swear is used with reference to the casting out of demons (Acts 19:13).

Noah Webster's New International Dictionary of the English Language

1. (n.) An earnest appeal; a solemn charging on oath, or under the penalty of a curse.

2. (n.) The form of oath or appeal.